peter's square in vatican city sunday for pope benedict's second to last republican appearance. he'll step down at the end of the month, and the vatican says a new pope could be installed by mid-march. pope benedict's last public appearance is scheduled for sunday. >>> in russia, a modern-day gold rush for meteor fragments. people say they found chunks of space rock buried in snow. if they're real the fragments could be worth thousands of dollars. meanwhile an army of volunteers turned up sunday after the blast that blew out windows in an industrial town about 950 miles from moscow. around 1,200 people were injured. >>> well it is tax season and tax fraud continues to be a growing problem. just last month, the irs made over 100 arrests in identifying theft-related cases, and as segtd doan reports, the irs is struggling to keep ahead of this crime wave. >> reporter: in 2011 joe bianco waited patiently for a $10,000 tax refund. when he contacted the irs, it said he had already been paid. >> somebody filed with a forged w-2 from walmart, claimed a refund, got the refund, using my n